handlebars_translate.js

Handlebars.registerHelper('trans', function(fn) {
    return gettext(fn(this));
});

parse_handlebars_translate.py

import optparse
import re

p = optparse.OptionParser()
p.add_option('--infile')
p.add_option('--outfile', default='translate.js')    
options, arguments = p.parse_args()
f = open(options.infile, 'r')
messages = re.findall(r'{{#trans}}(.*?){{/trans}}', ''.join(f.readlines()))
messages_js = ''.join(['gettext(\'%s\');\n' % msg for msg in messages])
f = open(options.outfile, 'a')
f.write(messages_js)
f.close()

run.sh

find ./ -iname "*.html" -exec python parse_handlebars_translate.py --infile={} \;

test_template.html

<div>
    {{#trans}}Translate 1{{/trans}}
    <p>{{#trans}}Translate 2{{/trans}}</p>
</div>